diff --git a/core/java/android/os/BatteryStats.java b/core/java/android/os/BatteryStats.java
index b178d81..cf4fd99 100644
--- a/core/java/android/os/BatteryStats.java
+++ b/core/java/android/os/BatteryStats.java
@@ -5160,9 +5160,7 @@
                         Uid.Proc.ExcessivePower ew = ps.getExcessivePower(e);
                         if (ew != null) {
                             pw.print(prefix); pw.print("      * Killed for ");
-                                    if (ew.type == Uid.Proc.ExcessivePower.TYPE_WAKE) {
-                                        pw.print("wake lock");
-                                    } else if (ew.type == Uid.Proc.ExcessivePower.TYPE_CPU) {
+                                    if (ew.type == Uid.Proc.ExcessivePower.TYPE_CPU) {
                                         pw.print("cpu");
                                     } else {
                                         pw.print("unknown");
diff --git a/core/java/android/provider/Settings.java b/core/java/android/provider/Settings.java
index e563360..3b6a11d 100755
--- a/core/java/android/provider/Settings.java
+++ b/core/java/android/provider/Settings.java
@@ -9161,9 +9161,11 @@
          * gc_min_interval                      (long)
          * full_pss_min_interval                (long)
          * full_pss_lowered_interval            (long)
-         * power_check_delay                    (long)
-         * wake_lock_min_check_duration         (long)
-         * cpu_min_check_duration               (long)
+         * power_check_interval                 (long)
+         * power_check_max_cpu_1                (int)
+         * power_check_max_cpu_2                (int)
+         * power_check_max_cpu_3                (int)
+         * power_check_max_cpu_4                (int)
          * service_usage_interaction_time       (long)
          * usage_stats_interaction_interval     (long)
          * service_restart_duration             (long)
diff --git a/core/java/com/android/internal/app/procstats/ProcessState.java b/core/java/com/android/internal/app/procstats/ProcessState.java
index 9470668..e0a4053 100644
--- a/core/java/com/android/internal/app/procstats/ProcessState.java
+++ b/core/java/com/android/internal/app/procstats/ProcessState.java
@@ -196,7 +196,6 @@
         ProcessState pnew = new ProcessState(this, mPackage, mUid, mVersion, mName, now);
         pnew.mDurations.addDurations(mDurations);
         pnew.mPssTable.copyFrom(mPssTable, PSS_COUNT);
-        pnew.mNumExcessiveWake = mNumExcessiveWake;
         pnew.mNumExcessiveCpu = mNumExcessiveCpu;
         pnew.mNumCachedKill = mNumCachedKill;
         pnew.mMinCachedKillPss = mMinCachedKillPss;
@@ -250,7 +249,6 @@
     public void add(ProcessState other) {
         mDurations.addDurations(other.mDurations);
         mPssTable.mergeStats(other.mPssTable);
-        mNumExcessiveWake += other.mNumExcessiveWake;
         mNumExcessiveCpu += other.mNumExcessiveCpu;
         if (other.mNumCachedKill > 0) {
             addCachedKill(other.mNumCachedKill, other.mMinCachedKillPss,
@@ -264,7 +262,6 @@
         mStartTime = now;
         mLastPssState = STATE_NOTHING;
         mLastPssTime = 0;
-        mNumExcessiveWake = 0;
         mNumExcessiveCpu = 0;
         mNumCachedKill = 0;
         mMinCachedKillPss = mAvgCachedKillPss = mMaxCachedKillPss = 0;
@@ -286,7 +283,7 @@
         out.writeInt(mMultiPackage ? 1 : 0);
         mDurations.writeToParcel(out);
         mPssTable.writeToParcel(out);
-        out.writeInt(mNumExcessiveWake);
+        out.writeInt(0);  // was mNumExcessiveWake
         out.writeInt(mNumExcessiveCpu);
         out.writeInt(mNumCachedKill);
         if (mNumCachedKill > 0) {
@@ -309,7 +306,7 @@
         if (!mPssTable.readFromParcel(in)) {
             return false;
         }
-        mNumExcessiveWake = in.readInt();
+        in.readInt(); // was mNumExcessiveWake
         mNumExcessiveCpu = in.readInt();
         mNumCachedKill = in.readInt();
         if (mNumCachedKill > 0) {
@@ -493,18 +490,6 @@
         }
     }
 
-    public void reportExcessiveWake(ArrayMap<String, ProcessStateHolder> pkgList) {
-        ensureNotDead();
-        mCommonProcess.mNumExcessiveWake++;
-        if (!mCommonProcess.mMultiPackage) {
-            return;
-        }
-
-        for (int ip=pkgList.size()-1; ip>=0; ip--) {
-            pullFixedProc(pkgList, ip).mNumExcessiveWake++;
-        }
-    }
-
     public void reportExcessiveCpu(ArrayMap<String, ProcessStateHolder> pkgList) {
         ensureNotDead();
         mCommonProcess.mNumExcessiveCpu++;
@@ -895,10 +880,6 @@
                 }
             }
         }
-        if (mNumExcessiveWake != 0) {
-            pw.print(prefix); pw.print("Killed for excessive wake locks: ");
-                    pw.print(mNumExcessiveWake); pw.println(" times");
-        }
         if (mNumExcessiveCpu != 0) {
             pw.print(prefix); pw.print("Killed for excessive CPU use: ");
                     pw.print(mNumExcessiveCpu); pw.println(" times");
@@ -1072,7 +1053,7 @@
             dumpAllPssCheckin(pw);
             pw.println();
         }
-        if (mNumExcessiveWake > 0 || mNumExcessiveCpu > 0 || mNumCachedKill > 0) {
+        if (mNumExcessiveCpu > 0 || mNumCachedKill > 0) {
             pw.print("pkgkills,");
             pw.print(pkgName);
             pw.print(",");
@@ -1082,7 +1063,7 @@
             pw.print(",");
             pw.print(DumpUtils.collapseString(pkgName, itemName));
             pw.print(",");
-            pw.print(mNumExcessiveWake);
+            pw.print("0"); // was mNumExcessiveWake
             pw.print(",");
             pw.print(mNumExcessiveCpu);
             pw.print(",");
@@ -1114,13 +1095,13 @@
             dumpAllPssCheckin(pw);
             pw.println();
         }
-        if (mNumExcessiveWake > 0 || mNumExcessiveCpu > 0 || mNumCachedKill > 0) {
+        if (mNumExcessiveCpu > 0 || mNumCachedKill > 0) {
             pw.print("kills,");
             pw.print(procName);
             pw.print(",");
             pw.print(uid);
             pw.print(",");
-            pw.print(mNumExcessiveWake);
+            pw.print("0"); // was mNumExcessiveWake
             pw.print(",");
             pw.print(mNumExcessiveCpu);
             pw.print(",");
diff --git a/core/java/com/android/internal/os/BatteryStatsImpl.java b/core/java/com/android/internal/os/BatteryStatsImpl.java
index 696dbda..cb00c5e 100644
--- a/core/java/com/android/internal/os/BatteryStatsImpl.java
+++ b/core/java/com/android/internal/os/BatteryStatsImpl.java
@@ -3987,14 +3987,6 @@
         return 0;
     }
 
-    public void reportExcessiveWakeLocked(int uid, String proc, long overTime, long usedTime) {
-        uid = mapUid(uid);
-        Uid u = mUidStats.get(uid);
-        if (u != null) {
-            u.reportExcessiveWakeLocked(proc, overTime, usedTime);
-        }
-    }
-
     public void reportExcessiveCpuLocked(int uid, String proc, long overTime, long usedTime) {
         uid = mapUid(uid);
         Uid u = mUidStats.get(uid);
@@ -7745,17 +7737,6 @@
                 return null;
             }
 
-            public void addExcessiveWake(long overTime, long usedTime) {
-                if (mExcessivePower == null) {
-                    mExcessivePower = new ArrayList<ExcessivePower>();
-                }
-                ExcessivePower ew = new ExcessivePower();
-                ew.type = ExcessivePower.TYPE_WAKE;
-                ew.overTime = overTime;
-                ew.usedTime = usedTime;
-                mExcessivePower.add(ew);
-            }
-
             public void addExcessiveCpu(long overTime, long usedTime) {
                 if (mExcessivePower == null) {
                     mExcessivePower = new ArrayList<ExcessivePower>();
@@ -8570,13 +8551,6 @@
             }
         }
 
-        public void reportExcessiveWakeLocked(String proc, long overTime, long usedTime) {
-            Proc p = getProcessStatsLocked(proc);
-            if (p != null) {
-                p.addExcessiveWake(overTime, usedTime);
-            }
-        }
-
         public void reportExcessiveCpuLocked(String proc, long overTime, long usedTime) {
             Proc p = getProcessStatsLocked(proc);
             if (p != null) {
diff --git a/services/core/java/com/android/server/am/ActivityManagerConstants.java b/services/core/java/com/android/server/am/ActivityManagerConstants.java
index 6c3fe91..2cd2603 100644
--- a/services/core/java/com/android/server/am/ActivityManagerConstants.java
+++ b/services/core/java/com/android/server/am/ActivityManagerConstants.java
@@ -48,9 +48,11 @@
     private static final String KEY_GC_MIN_INTERVAL = "gc_min_interval";
     private static final String KEY_FULL_PSS_MIN_INTERVAL = "full_pss_min_interval";
     private static final String KEY_FULL_PSS_LOWERED_INTERVAL = "full_pss_lowered_interval";
-    private static final String KEY_POWER_CHECK_DELAY = "power_check_delay";
-    private static final String KEY_WAKE_LOCK_MIN_CHECK_DURATION = "wake_lock_min_check_duration";
-    private static final String KEY_CPU_MIN_CHECK_DURATION = "cpu_min_check_duration";
+    private static final String KEY_POWER_CHECK_INTERVAL = "power_check_interval";
+    private static final String KEY_POWER_CHECK_MAX_CPU_1 = "power_check_max_cpu_1";
+    private static final String KEY_POWER_CHECK_MAX_CPU_2 = "power_check_max_cpu_2";
+    private static final String KEY_POWER_CHECK_MAX_CPU_3 = "power_check_max_cpu_3";
+    private static final String KEY_POWER_CHECK_MAX_CPU_4 = "power_check_max_cpu_4";
     private static final String KEY_SERVICE_USAGE_INTERACTION_TIME
             = "service_usage_interaction_time";
     private static final String KEY_USAGE_STATS_INTERACTION_INTERVAL
@@ -73,11 +75,11 @@
     private static final long DEFAULT_GC_MIN_INTERVAL = 60*1000;
     private static final long DEFAULT_FULL_PSS_MIN_INTERVAL = 10*60*1000;
     private static final long DEFAULT_FULL_PSS_LOWERED_INTERVAL = 2*60*1000;
-    private static final long DEFAULT_POWER_CHECK_DELAY = (DEBUG_POWER_QUICK ? 2 : 15) * 60*1000;
-    private static final long DEFAULT_WAKE_LOCK_MIN_CHECK_DURATION
-            = (DEBUG_POWER_QUICK ? 1 : 5) * 60*1000;
-    private static final long DEFAULT_CPU_MIN_CHECK_DURATION
-            = (DEBUG_POWER_QUICK ? 1 : 5) * 60*1000;
+    private static final long DEFAULT_POWER_CHECK_INTERVAL = (DEBUG_POWER_QUICK ? 1 : 5) * 60*1000;
+    private static final int DEFAULT_POWER_CHECK_MAX_CPU_1 = 25;
+    private static final int DEFAULT_POWER_CHECK_MAX_CPU_2 = 25;
+    private static final int DEFAULT_POWER_CHECK_MAX_CPU_3 = 10;
+    private static final int DEFAULT_POWER_CHECK_MAX_CPU_4 = 2;
     private static final long DEFAULT_SERVICE_USAGE_INTERACTION_TIME = 30*60*1000;
     private static final long DEFAULT_USAGE_STATS_INTERACTION_INTERVAL = 24*60*60*1000L;
     private static final long DEFAULT_SERVICE_RESTART_DURATION = 1*1000;
@@ -133,16 +135,26 @@
     // when the request is due to the memory state being lowered.
     long FULL_PSS_LOWERED_INTERVAL = DEFAULT_FULL_PSS_LOWERED_INTERVAL;
 
-    // The rate at which we check for apps using excessive power -- 15 mins.
-    long POWER_CHECK_DELAY = DEFAULT_POWER_CHECK_DELAY;
-
-    // The minimum sample duration we will allow before deciding we have
-    // enough data on wake locks to start killing things.
-    long WAKE_LOCK_MIN_CHECK_DURATION = DEFAULT_WAKE_LOCK_MIN_CHECK_DURATION;
-
     // The minimum sample duration we will allow before deciding we have
     // enough data on CPU usage to start killing things.
-    long CPU_MIN_CHECK_DURATION = DEFAULT_CPU_MIN_CHECK_DURATION;
+    long POWER_CHECK_INTERVAL = DEFAULT_POWER_CHECK_INTERVAL;
+
+    // The maximum CPU (as a percentage) a process is allowed to use over the first
+    // power check interval that it is cached.
+    int POWER_CHECK_MAX_CPU_1 = DEFAULT_POWER_CHECK_MAX_CPU_1;
+
+    // The maximum CPU (as a percentage) a process is allowed to use over the second
+    // power check interval that it is cached.  The home app will never check for less
+    // CPU than this (it will not test against the 3 or 4 levels).
+    int POWER_CHECK_MAX_CPU_2 = DEFAULT_POWER_CHECK_MAX_CPU_2;
+
+    // The maximum CPU (as a percentage) a process is allowed to use over the third
+    // power check interval that it is cached.
+    int POWER_CHECK_MAX_CPU_3 = DEFAULT_POWER_CHECK_MAX_CPU_3;
+
+    // The maximum CPU (as a percentage) a process is allowed to use over the fourth
+    // power check interval that it is cached.
+    int POWER_CHECK_MAX_CPU_4 = DEFAULT_POWER_CHECK_MAX_CPU_4;
 
     // This is the amount of time an app needs to be running a foreground service before
     // we will consider it to be doing interaction for usage stats.
@@ -270,12 +282,16 @@
                     DEFAULT_FULL_PSS_MIN_INTERVAL);
             FULL_PSS_LOWERED_INTERVAL = mParser.getLong(KEY_FULL_PSS_LOWERED_INTERVAL,
                     DEFAULT_FULL_PSS_LOWERED_INTERVAL);
-            POWER_CHECK_DELAY = mParser.getLong(KEY_POWER_CHECK_DELAY,
-                    DEFAULT_POWER_CHECK_DELAY);
-            WAKE_LOCK_MIN_CHECK_DURATION = mParser.getLong(KEY_WAKE_LOCK_MIN_CHECK_DURATION,
-                    DEFAULT_WAKE_LOCK_MIN_CHECK_DURATION);
-            CPU_MIN_CHECK_DURATION = mParser.getLong(KEY_CPU_MIN_CHECK_DURATION,
-                    DEFAULT_CPU_MIN_CHECK_DURATION);
+            POWER_CHECK_INTERVAL = mParser.getLong(KEY_POWER_CHECK_INTERVAL,
+                    DEFAULT_POWER_CHECK_INTERVAL);
+            POWER_CHECK_MAX_CPU_1 = mParser.getInt(KEY_POWER_CHECK_MAX_CPU_1,
+                    DEFAULT_POWER_CHECK_MAX_CPU_1);
+            POWER_CHECK_MAX_CPU_2 = mParser.getInt(KEY_POWER_CHECK_MAX_CPU_2,
+                    DEFAULT_POWER_CHECK_MAX_CPU_2);
+            POWER_CHECK_MAX_CPU_3 = mParser.getInt(KEY_POWER_CHECK_MAX_CPU_3,
+                    DEFAULT_POWER_CHECK_MAX_CPU_3);
+            POWER_CHECK_MAX_CPU_4 = mParser.getInt(KEY_POWER_CHECK_MAX_CPU_4,
+                    DEFAULT_POWER_CHECK_MAX_CPU_4);
             SERVICE_USAGE_INTERACTION_TIME = mParser.getLong(KEY_SERVICE_USAGE_INTERACTION_TIME,
                     DEFAULT_SERVICE_USAGE_INTERACTION_TIME);
             USAGE_STATS_INTERACTION_INTERVAL = mParser.getLong(KEY_USAGE_STATS_INTERACTION_INTERVAL,
@@ -335,12 +351,16 @@
         pw.println(FULL_PSS_MIN_INTERVAL);
         pw.print("  "); pw.print(KEY_FULL_PSS_LOWERED_INTERVAL); pw.print("=");
         pw.println(FULL_PSS_LOWERED_INTERVAL);
-        pw.print("  "); pw.print(KEY_POWER_CHECK_DELAY); pw.print("=");
-        pw.println(POWER_CHECK_DELAY);
-        pw.print("  "); pw.print(KEY_WAKE_LOCK_MIN_CHECK_DURATION); pw.print("=");
-        pw.println(WAKE_LOCK_MIN_CHECK_DURATION);
-        pw.print("  "); pw.print(KEY_CPU_MIN_CHECK_DURATION); pw.print("=");
-        pw.println(CPU_MIN_CHECK_DURATION);
+        pw.print("  "); pw.print(KEY_POWER_CHECK_INTERVAL); pw.print("=");
+        pw.println(POWER_CHECK_INTERVAL);
+        pw.print("  "); pw.print(KEY_POWER_CHECK_MAX_CPU_1); pw.print("=");
+        pw.println(POWER_CHECK_MAX_CPU_1);
+        pw.print("  "); pw.print(KEY_POWER_CHECK_MAX_CPU_2); pw.print("=");
+        pw.println(POWER_CHECK_MAX_CPU_2);
+        pw.print("  "); pw.print(KEY_POWER_CHECK_MAX_CPU_3); pw.print("=");
+        pw.println(POWER_CHECK_MAX_CPU_3);
+        pw.print("  "); pw.print(KEY_POWER_CHECK_MAX_CPU_4); pw.print("=");
+        pw.println(POWER_CHECK_MAX_CPU_4);
         pw.print("  "); pw.print(KEY_SERVICE_USAGE_INTERACTION_TIME); pw.print("=");
         pw.println(SERVICE_USAGE_INTERACTION_TIME);
         pw.print("  "); pw.print(KEY_USAGE_STATS_INTERACTION_INTERVAL); pw.print("=");
diff --git a/services/core/java/com/android/server/am/ActivityManagerService.java b/services/core/java/com/android/server/am/ActivityManagerService.java
index 3675ecf..94bd6f5 100644
--- a/services/core/java/com/android/server/am/ActivityManagerService.java
+++ b/services/core/java/com/android/server/am/ActivityManagerService.java
@@ -255,7 +255,6 @@
 import android.content.IIntentSender;
 import android.content.Intent;
 import android.content.IntentFilter;
-import android.content.IntentSender;
 import android.content.pm.ActivityInfo;
 import android.content.pm.ApplicationInfo;
 import android.content.pm.ConfigurationInfo;
@@ -1320,11 +1319,6 @@
     boolean mDidAppSwitch;
 
     /**
-     * Last time (in realtime) at which we checked for power usage.
-     */
-    long mLastPowerCheckRealtime;
-
-    /**
      * Last time (in uptime) at which we checked for power usage.
      */
     long mLastPowerCheckUptime;
@@ -1658,7 +1652,7 @@
     static final int POST_HEAVY_NOTIFICATION_MSG = 24;
     static final int CANCEL_HEAVY_NOTIFICATION_MSG = 25;
     static final int SHOW_STRICT_MODE_VIOLATION_UI_MSG = 26;
-    static final int CHECK_EXCESSIVE_WAKE_LOCKS_MSG = 27;
+    static final int CHECK_EXCESSIVE_POWER_USE_MSG = 27;
     static final int CLEAR_DNS_CACHE_MSG = 28;
     static final int UPDATE_HTTP_PROXY_MSG = 29;
     static final int SHOW_COMPAT_MODE_DIALOG_UI_MSG = 30;
@@ -2123,12 +2117,12 @@
                 } catch (RemoteException e) {
                 }
             } break;
-            case CHECK_EXCESSIVE_WAKE_LOCKS_MSG: {
+            case CHECK_EXCESSIVE_POWER_USE_MSG: {
                 synchronized (ActivityManagerService.this) {
-                    checkExcessivePowerUsageLocked(true);
-                    removeMessages(CHECK_EXCESSIVE_WAKE_LOCKS_MSG);
-                    Message nmsg = obtainMessage(CHECK_EXCESSIVE_WAKE_LOCKS_MSG);
-                    sendMessageDelayed(nmsg, mConstants.POWER_CHECK_DELAY);
+                    checkExcessivePowerUsageLocked();
+                    removeMessages(CHECK_EXCESSIVE_POWER_USE_MSG);
+                    Message nmsg = obtainMessage(CHECK_EXCESSIVE_POWER_USE_MSG);
+                    sendMessageDelayed(nmsg, mConstants.POWER_CHECK_INTERVAL);
                 }
             } break;
             case REPORT_MEM_USAGE_MSG: {
@@ -3003,6 +2997,9 @@
                                     }
                                     ps.addCpuTimeLocked(st.rel_utime, st.rel_stime);
                                     pr.curCpuTime += st.rel_utime + st.rel_stime;
+                                    if (pr.lastCpuTime == 0) {
+                                        pr.lastCpuTime = pr.curCpuTime;
+                                    }
                                 } else {
                                     BatteryStatsImpl.Uid.Proc ps = st.batteryStats;
                                     if (ps == null || !ps.isActive()) {
@@ -7253,8 +7250,8 @@
 
             if (mFactoryTest != FactoryTest.FACTORY_TEST_LOW_LEVEL) {
                 // Start looking for apps that are abusing wake locks.
-                Message nmsg = mHandler.obtainMessage(CHECK_EXCESSIVE_WAKE_LOCKS_MSG);
-                mHandler.sendMessageDelayed(nmsg, mConstants.POWER_CHECK_DELAY);
+                Message nmsg = mHandler.obtainMessage(CHECK_EXCESSIVE_POWER_USE_MSG);
+                mHandler.sendMessageDelayed(nmsg, mConstants.POWER_CHECK_INTERVAL);
                 // Tell anyone interested that we are done booting!
                 SystemProperties.set("sys.boot_completed", "1");
 
@@ -12445,12 +12442,6 @@
             mStackSupervisor.goingToSleepLocked();
             sendNotifyVrManagerOfSleepState(true);
             updateOomAdjLocked();
-
-            // Initialize the wake times of all processes.
-            checkExcessivePowerUsageLocked(false);
-            mHandler.removeMessages(CHECK_EXCESSIVE_WAKE_LOCKS_MSG);
-            Message nmsg = mHandler.obtainMessage(CHECK_EXCESSIVE_WAKE_LOCKS_MSG);
-            mHandler.sendMessageDelayed(nmsg, mConstants.POWER_CHECK_DELAY);
         }
 
         // Also update state in a special way for running foreground services UI.
@@ -15951,9 +15942,6 @@
                 pw.println("  mBooting=" + mBooting
                         + " mCallFinishBooting=" + mCallFinishBooting
                         + " mBootAnimationComplete=" + mBootAnimationComplete);
-                pw.print("  mLastPowerCheckRealtime=");
-                        TimeUtils.formatDuration(mLastPowerCheckRealtime, pw);
-                        pw.println("");
                 pw.print("  mLastPowerCheckUptime=");
                         TimeUtils.formatDuration(mLastPowerCheckUptime, pw);
                         pw.println("");
@@ -16608,8 +16596,6 @@
 
         Collections.sort(list, comparator);
 
-        final long curRealtime = SystemClock.elapsedRealtime();
-        final long realtimeSince = curRealtime - service.mLastPowerCheckRealtime;
         final long curUptime = SystemClock.uptimeMillis();
         final long uptimeSince = curUptime - service.mLastPowerCheckUptime;
 
@@ -16706,24 +16692,6 @@
                 pw.print(" hasAboveClient="); pw.println(r.hasAboveClient);
 
                 if (r.setProcState >= ActivityManager.PROCESS_STATE_SERVICE) {
-                    if (r.lastWakeTime != 0) {
-                        long wtime;
-                        BatteryStatsImpl stats = service.mBatteryStatsService.getActiveStatistics();
-                        synchronized (stats) {
-                            wtime = stats.getProcessWakeTime(r.info.uid,
-                                    r.pid, curRealtime);
-                        }
-                        long timeUsed = wtime - r.lastWakeTime;
-                        pw.print(prefix);
-                        pw.print("    ");
-                        pw.print("keep awake over ");
-                        TimeUtils.formatDuration(realtimeSince, pw);
-                        pw.print(" used ");
-                        TimeUtils.formatDuration(timeUsed, pw);
-                        pw.print(" (");
-                        pw.print((timeUsed*100)/realtimeSince);
-                        pw.println("%)");
-                    }
                     if (r.lastCpuTime != 0) {
                         long timeUsed = r.curCpuTime - r.lastCpuTime;
                         pw.print(prefix);
@@ -21862,58 +21830,28 @@
         }
     }
 
-    final void checkExcessivePowerUsageLocked(boolean doKills) {
+    final void checkExcessivePowerUsageLocked() {
         updateCpuStatsNow();
 
         BatteryStatsImpl stats = mBatteryStatsService.getActiveStatistics();
-        boolean doWakeKills = doKills;
-        boolean doCpuKills = doKills;
-        if (mLastPowerCheckRealtime == 0) {
-            doWakeKills = false;
-        }
+        boolean doCpuKills = true;
         if (mLastPowerCheckUptime == 0) {
             doCpuKills = false;
         }
-        if (stats.isScreenOn()) {
-            doWakeKills = false;
-        }
-        final long curRealtime = SystemClock.elapsedRealtime();
-        final long realtimeSince = curRealtime - mLastPowerCheckRealtime;
         final long curUptime = SystemClock.uptimeMillis();
         final long uptimeSince = curUptime - mLastPowerCheckUptime;
-        mLastPowerCheckRealtime = curRealtime;
         mLastPowerCheckUptime = curUptime;
-        if (realtimeSince < mConstants.WAKE_LOCK_MIN_CHECK_DURATION) {
-            doWakeKills = false;
-        }
-        if (uptimeSince < mConstants.CPU_MIN_CHECK_DURATION) {
-            doCpuKills = false;
-        }
         int i = mLruProcesses.size();
         while (i > 0) {
             i--;
             ProcessRecord app = mLruProcesses.get(i);
             if (app.setProcState >= ActivityManager.PROCESS_STATE_HOME) {
-                long wtime;
-                synchronized (stats) {
-                    wtime = stats.getProcessWakeTime(app.info.uid,
-                            app.pid, curRealtime);
+                if (app.lastCpuTime <= 0) {
+                    continue;
                 }
-                long wtimeUsed = wtime - app.lastWakeTime;
                 long cputimeUsed = app.curCpuTime - app.lastCpuTime;
                 if (DEBUG_POWER) {
                     StringBuilder sb = new StringBuilder(128);
-                    sb.append("Wake for ");
-                    app.toShortString(sb);
-                    sb.append(": over ");
-                    TimeUtils.formatDuration(realtimeSince, sb);
-                    sb.append(" used ");
-                    TimeUtils.formatDuration(wtimeUsed, sb);
-                    sb.append(" (");
-                    sb.append((wtimeUsed*100)/realtimeSince);
-                    sb.append("%)");
-                    Slog.i(TAG_POWER, sb.toString());
-                    sb.setLength(0);
                     sb.append("CPU for ");
                     app.toShortString(sb);
                     sb.append(": over ");
@@ -21925,29 +21863,33 @@
                     sb.append("%)");
                     Slog.i(TAG_POWER, sb.toString());
                 }
-                // If a process has held a wake lock for more
-                // than 50% of the time during this period,
-                // that sounds bad.  Kill!
-                if (doWakeKills && realtimeSince > 0
-                        && ((wtimeUsed*100)/realtimeSince) >= 50) {
-                    synchronized (stats) {
-                        stats.reportExcessiveWakeLocked(app.info.uid, app.processName,
-                                realtimeSince, wtimeUsed);
+                // If the process has used too much CPU over the last duration, the
+                // user probably doesn't want this, so kill!
+                if (doCpuKills && uptimeSince > 0) {
+                    // What is the limit for this process?
+                    int cpuLimit;
+                    long checkDur = curUptime - app.whenUnimportant;
+                    if (checkDur <= mConstants.POWER_CHECK_INTERVAL) {
+                        cpuLimit = mConstants.POWER_CHECK_MAX_CPU_1;
+                    } else if (checkDur <= (mConstants.POWER_CHECK_INTERVAL*2)
+                            || app.setProcState <= ActivityManager.PROCESS_STATE_HOME) {
+                        cpuLimit = mConstants.POWER_CHECK_MAX_CPU_2;
+                    } else if (checkDur <= (mConstants.POWER_CHECK_INTERVAL*3)) {
+                        cpuLimit = mConstants.POWER_CHECK_MAX_CPU_3;
+                    } else {
+                        cpuLimit = mConstants.POWER_CHECK_MAX_CPU_4;
                     }
-                    app.kill("excessive wake held " + wtimeUsed + " during " + realtimeSince, true);
-                    app.baseProcessTracker.reportExcessiveWake(app.pkgList);
-                } else if (doCpuKills && uptimeSince > 0
-                        && ((cputimeUsed*100)/uptimeSince) >= 25) {
-                    synchronized (stats) {
-                        stats.reportExcessiveCpuLocked(app.info.uid, app.processName,
-                                uptimeSince, cputimeUsed);
+                    if (((cputimeUsed*100)/uptimeSince) >= cpuLimit) {
+                        synchronized (stats) {
+                            stats.reportExcessiveCpuLocked(app.info.uid, app.processName,
+                                    uptimeSince, cputimeUsed);
+                        }
+                        app.kill("excessive cpu " + cputimeUsed + " during " + uptimeSince
+                                + " dur=" + checkDur + " limit=" + cpuLimit, true);
+                        app.baseProcessTracker.reportExcessiveCpu(app.pkgList);
                     }
-                    app.kill("excessive cpu " + cputimeUsed + " during " + uptimeSince, true);
-                    app.baseProcessTracker.reportExcessiveCpu(app.pkgList);
-                } else {
-                    app.lastWakeTime = wtime;
-                    app.lastCpuTime = app.curCpuTime;
                 }
+                app.lastCpuTime = app.curCpuTime;
             }
         }
     }
@@ -22121,15 +22063,10 @@
             if (setImportant && !curImportant) {
                 // This app is no longer something we consider important enough to allow to
                 // use arbitrary amounts of battery power.  Note
-                // its current wake lock time to later know to kill it if
+                // its current CPU time to later know to kill it if
                 // it is not behaving well.
-                BatteryStatsImpl stats = mBatteryStatsService.getActiveStatistics();
-                synchronized (stats) {
-                    app.lastWakeTime = stats.getProcessWakeTime(app.info.uid,
-                            app.pid, nowElapsed);
-                }
-                app.lastCpuTime = app.curCpuTime;
-
+                app.whenUnimportant = now;
+                app.lastCpuTime = 0;
             }
             // Inform UsageStats of important process state change
             // Must be called before updating setProcState
diff --git a/services/core/java/com/android/server/am/ProcessRecord.java b/services/core/java/com/android/server/am/ProcessRecord.java
index 53c7f84..411e973 100644
--- a/services/core/java/com/android/server/am/ProcessRecord.java
+++ b/services/core/java/com/android/server/am/ProcessRecord.java
@@ -143,7 +143,7 @@
     ActiveInstrumentation instr;// Set to currently active instrumentation running in process
     boolean usingWrapper;       // Set to true when process was launched with a wrapper attached
     final ArraySet<BroadcastRecord> curReceivers = new ArraySet<BroadcastRecord>();// receivers currently running in the app
-    long lastWakeTime;          // How long proc held wake lock at last check
+    long whenUnimportant;       // When (uptime) the process last became unimportant
     long lastCpuTime;           // How long proc has run CPU at last check
     long curCpuTime;            // How long proc has run CPU most recently
     long lastRequestedGc;       // When we last asked the app to do a gc
@@ -204,7 +204,7 @@
     boolean whitelistManager;
 
     void dump(PrintWriter pw, String prefix) {
-        final long now = SystemClock.uptimeMillis();
+        final long nowUptime = SystemClock.uptimeMillis();
 
         pw.print(prefix); pw.print("user #"); pw.print(userId);
                 pw.print(" uid="); pw.print(info.uid);
@@ -254,11 +254,11 @@
         pw.print(prefix); pw.print("pid="); pw.print(pid); pw.print(" starting=");
                 pw.println(starting);
         pw.print(prefix); pw.print("lastActivityTime=");
-                TimeUtils.formatDuration(lastActivityTime, now, pw);
+                TimeUtils.formatDuration(lastActivityTime, nowUptime, pw);
                 pw.print(" lastPssTime=");
-                TimeUtils.formatDuration(lastPssTime, now, pw);
+                TimeUtils.formatDuration(lastPssTime, nowUptime, pw);
                 pw.print(" nextPssTime=");
-                TimeUtils.formatDuration(nextPssTime, now, pw);
+                TimeUtils.formatDuration(nextPssTime, nowUptime, pw);
                 pw.println();
         pw.print(prefix); pw.print("adjSeq="); pw.print(adjSeq);
                 pw.print(" lruSeq="); pw.print(lruSeq);
@@ -294,7 +294,7 @@
                 pw.print(" pssProcState="); pw.print(pssProcState);
                 pw.print(" setProcState="); pw.print(setProcState);
                 pw.print(" lastStateTime=");
-                TimeUtils.formatDuration(lastStateTime, now, pw);
+                TimeUtils.formatDuration(lastStateTime, nowUptime, pw);
                 pw.println();
         if (hasShownUi || pendingUiClean || hasAboveClient || treatLikeActivity) {
             pw.print(prefix); pw.print("hasShownUi="); pw.print(hasShownUi);
@@ -334,29 +334,26 @@
         }
         if (lastProviderTime > 0) {
             pw.print(prefix); pw.print("lastProviderTime=");
-            TimeUtils.formatDuration(lastProviderTime, now, pw);
+            TimeUtils.formatDuration(lastProviderTime, nowUptime, pw);
             pw.println();
         }
         if (hasStartedServices) {
             pw.print(prefix); pw.print("hasStartedServices="); pw.println(hasStartedServices);
         }
-        if (setProcState >= ActivityManager.PROCESS_STATE_SERVICE) {
-            long wtime;
-            synchronized (mBatteryStats) {
-                wtime = mBatteryStats.getProcessWakeTime(info.uid,
-                        pid, SystemClock.elapsedRealtime());
-            }
-            pw.print(prefix); pw.print("lastWakeTime="); pw.print(lastWakeTime);
-                    pw.print(" timeUsed=");
-                    TimeUtils.formatDuration(wtime-lastWakeTime, pw); pw.println("");
+        if (setProcState > ActivityManager.PROCESS_STATE_SERVICE) {
             pw.print(prefix); pw.print("lastCpuTime="); pw.print(lastCpuTime);
-                    pw.print(" timeUsed=");
-                    TimeUtils.formatDuration(curCpuTime-lastCpuTime, pw); pw.println("");
+                    if (lastCpuTime > 0) {
+                        pw.print(" timeUsed=");
+                        TimeUtils.formatDuration(curCpuTime - lastCpuTime, pw);
+                    }
+                    pw.print(" whenUnimportant=");
+                    TimeUtils.formatDuration(whenUnimportant - nowUptime, pw);
+                    pw.println();
         }
         pw.print(prefix); pw.print("lastRequestedGc=");
-                TimeUtils.formatDuration(lastRequestedGc, now, pw);
+                TimeUtils.formatDuration(lastRequestedGc, nowUptime, pw);
                 pw.print(" lastLowMemory=");
-                TimeUtils.formatDuration(lastLowMemory, now, pw);
+                TimeUtils.formatDuration(lastLowMemory, nowUptime, pw);
                 pw.print(" reportLowMemory="); pw.println(reportLowMemory);
         if (killed || killedByAm || waitingToKill != null) {
             pw.print(prefix); pw.print("killed="); pw.print(killed);